I've a German user and he has already tested different php versions, also different gd libraries but we can't find the issue.
www.kunena.org/forum/36-German/134327-ho...r-erscheinen-gedreht
We only know, that the exif data of the image includes informations that it must be rotated (the camera was while photographing turned by 90 °). The error occurs when the image must be rotated.